I recently read about a free application called Secunia PSI which scans all your software and lists all the updates and security patches that you probably have missed. It directs to the appropriate place to fix your current programs. Very handy

Thanks for the link MEF. I tried the online scan version and it identified insecurities in my installed versions of Adobe Reader 8, Adobe Flash Player 9, Apple QuickTime 7 and Sun Java JRE. The scan took about 8 minutes but they claim it would take under 1 minute if I had no ant-virus installed. Impressive.